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Constitution v1.03
By-Laws v1.04
Class Rules v1.13
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Equipment Rules of Sailing (ISAF website)
 

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SONAR CLASS ASSOCIATION
 
CLASS RULES v1.13
Effective June 10, 2015
 
NOTE: Rules preceded by a *** indicate changes from the previously
adopted rules.
 

INDEX
PART I – ADMINISTRATION
Section A – General
A.1 Type of Class Rules-------------
A.2 Language-------------------------
A.3 Abbreviations--------------------
A.4 Authorities and Responsibilities
-------------------------------------
A.5 Administration of the Class----
A.6 ISAF and SCA Rules-----------
A.7 Sailing Instructions-------------
A.8 Amendments to the Class Rules
A.9 Interpretation of Class Rules---
A.10 International Class Fee(s) and
ISAF Plaque---------------------
A.11 Sail Numbers--------------------
A.12 Initial Certification--------------
A.13 Validity of Certificates---------
A.14 Re-Certification-----------------
Section B – Boat Eligibility
B.1 Certificate------------------------
B.2 Responsibility--------------------
B.3 Class Membership--------------

PART II - REQUIREMENTS AND LIMITATIONS
Section C – Conditions for Racing
C.1 Advertising-----------------------
C.2 Crew------------------------------
C.3 Equipment------------------------
C.4 Boat-------------------------------
C.5 Hull and Deck-------------------
C.6 Hull appendages-----------------
C.7 Rig--------------------------------
C.8 Sails-------------------------------

Section D – Hull and Deck
D.1 Parts-------------------------------
D.2 Construction---------------------
D.3 Measurement---------------------
D.4 Certification----------------------
D.5 Identification---------------------
D.6 Builders---------------------------
D.7 Assembled Hull-----------------

Section E – Hull Appendages
E.1 Parts-------------------------------
E.2 Measurement --------------------
E.3 Keel-------------------------------
E.4 Rudder Blade, Rudder Stock
and Tiller-------------------------

Section F – Rig
F.1 Parts-------------------------------
F.2 General---------------------------
F.3 Mast-------------------------------
F.4 Boom-----------------------------
F.5 Spinnaker Pole------------------
F.6 Whisker Pole--------------------
F.7 Standing Rigging----------------
F.8 Running Rigging----------------

Section G – Sails
G.1 Parts-------------------------------
G.2 Measurement --------------------
G.3 Certification----------------------
G.4 Sailmakers-----------------------
G.5 Mainsail--------------------------
G.6 Headsail--------------------------
G.7 Spinnakers-----------------------

PART III - APPENDICES
Appendix A – Documents
Section H - Official Plans and Forms
Appendix B – Alternative Rules
Section I – Conditions for Racing
I.1 General---------------------------
I.2 Definitions-----------------------
I.3 Advertising-----------------------
I.4 Eligibility-------------------------
I.5 Crew------------------------------
I.6 Equipment------------------------
I.7 Boat-------------------------------
I.8 Running Rigging

 
PART I – ADMINISTRATION
Section A – General
A.1 TYPE OF CLASS RULES
A.1.1 These are closed class rules. The Constitution, By-Laws and class rules shall
be interpreted to insure continued competition between boats of identical
design and construction.
A.2 LANGUAGE
A.2.1 The official language of the class is English and in case of dispute over
translation the English text shall prevail.
A.2.2 The word “shall” is mandatory and the word “may” is permissive.
A.2.3 The term “secured” shall mean held in place by positive means.
A.2.4 The term “fastened” shall mean held in place with bolts or screws.
A.2.5 The term “permanent” shall mean unable to be removed with simple tools.
A.2.6 The term “alteration” shall mean a substantial change from the original
condition.
A.3 ABBREVIATIONS
A.3.1 ISAF International Sailing Federation
 MNA ISAF Member National Authority
 SCA Sonar Class Association
 NCA National Class Association
 ERS Equipment Rules of Sailing
 RRS Racing Rules of Sailing
 IFDS International Foundation Disabled Sailing
A.4 AUTHORITIES AND RESPONSIBILITIES
A.4.1 The international authority of the class is the ISAF, which shall co-operate
with the SCA in all matters concerning these class rules.
A.4.2 Unless otherwise designated by the SCA, the certification authority shall be
the SCA.
A.4.3 The SCA shall appoint official measurers or shall authorize a certification
authority or an NCA to do so.
A.4.4 Neither the ISAF, the MNA, the SCA, an NCA, the IFDS, the certification
authority nor an official measurer is under any legal responsibility in respect
to these class rules or accuracy of measurement and no claim arising from
them can be entertained.
A.4.5 Notwithstanding anything contained herein, the certification authority has
the authority to withdraw a certificate and shall do so on the request of the
ISAF.
 
A.5 ADMINISTRATION OF THE CLASS
A.5.1 ISAF has delegated its administrative functions of the class to SCA. The SCA
may delegate part or all of its functions, as stated in these class rules, to an
NCA.
A.6 ISAF AND SCA RULES
A.6.1 These class rules shall be read in conjunction with the ERS and the RRS.
Where a term is used in its defined sense, it is printed in “bold” type if defined
in the ERS, in “italic” type if defined in the RRS and underlined if defined by
the SCA.
A.7 SAILING INSTRUCTIONS
A.7.1 Sailing instructions shall not vary these class rules except with the consent of
the SCA.
A.8 AMENDMENTS TO CLASS RULES
A.8.1 Amendments to these class rules shall require approval by the Executive
Committee and the ISAF.
A.8.2 Proposed amendments may be made in writing to the Executive Committee of
the SCA by the Technical Committee of the SCA.
A.9 INTERPRETATION OF CLASS RULES
A.9.1 GENERAL
 Interpretation of class rules, except as provided by A.9.2, shall be made in
accordance with the ISAF Regulations.
A.9.2 AT A REGATTA
A jury may make any interpretation of class rules required at a regatta. Such
interpretation shall only be valid during the regatta and the organising
authority shall, as soon as practical after the regatta, inform the ISAF and the
SCA of such interpretation.
A.10 INTERNATIONAL CLASS FEE(S) AND ISAF PLAQUE
A.10.1 Builders shall be licensed with the approval of the SCA and ISAF.
A.10.2 The International Class Fee(s) shall be paid by the licensed builder.
A.10.2 ISAF shall, after having received the International Class Fee for the hull, send
the ISAF Building Plaque and a measurement form to the licensed builder and
forward the appropriate portion of the Class Fee(s) to the SCA.
A.11 SAIL NUMBERS.
A.11.1 Sail numbers shall be issued by the SCA and shall be sequential.
A.11.2 A boat’s official sail number shall be the same as the hull.
A.11.3 An owner shall possess an SCA assigned sail number.
A.12 INITIAL CERTIFICATION
A.12.1 For a hull not previously certified, all items required to be measured by the
measurement form shall be measured by an official measurer and the details
entered onto the form.
 
A.12.2 The measurement form, together with any certification fee, shall be sent to
the certification authority within two weeks after completion of
measurement.
A.12.3 Upon receipt of a satisfactorily completed measurement form, the
certification authority shall issue a certificate. The certification authority
shall retain the original measurement form.
A.12.4 If a licensed builder has been determined by the Executive Committee of the
SCA to have signed a measurement form for a hull that did not measure
correctly, it shall be required to rectify the error to the satisfaction of the
certification authority, and may have it’s license as a builder withdrawn.
A.13 VALIDITY OF CERTIFICATES
A.13.1 A certificate becomes invalid upon:
(a) invalidation or revocation by the certification authority, or;
(b) any alteration or repair to items required to be measured by the
measurement form, other than permitted routine maintenance.
A.14 RE-CERTIFICATION
A.14.1 Upon invalidation the owner shall apply to the certification authority for a
new certificate together with any re-certification fee that may be required. A
new certificate shall then be issued to the owner.
A.14.2 Upon alteration or repair to an item required to be measured by the
measurement form, the relevant item shall be re-measured by an official
measurer and the details entered on a new form. The new form and any re-
certification fee that may be required shall be sent to the certification
authority within 4 weeks after completion. A new certificate, showing the
dates of initial and new fundamental measurement, shall then be issued to
the owner.
A.14.3 Upon alteration to corrector weights the boat shall be re-weighed by an
official measurer and the details entered on the hull certification mark and
the changes registered with the certification authority.
Section B – Boat Eligibility
For a boat to be eligible to race, she shall comply with the SCA By-Laws and the rules
in this section.
B.1 CERTIFICATE
B.1.1 No Boat shall be entitled to race as a bona-fide Sonar unless:
(a) an owner holds a valid certificate in his own name for the yacht concerned
and;
(b) the annual dues have been paid to the SCA and;
(c) a current SCA Membership Sticker and hull certification mark are
affixed to the hull in accordance with rule C.5.1.
B.2 RESPONSIBILITY
B.2.1 An owner shall agree to the one-design principle of the class and shall do
nothing during the course of ownership to cause this principle to be violated.
 
B.3 CLASS MEMBERSHIP
B.3.1 An owner shall be a current Active Member of the SCA.
 
PART II – REQUIREMENTS AND
LIMITATIONS
• A boat and its crew shall comply with the rules in this Part when racing.
• Measurement required by these rules, except for Section C, is part of fundamental
measurement that shall only be carried out by an official measurer.
Section C – Conditions for Racing
C.1 ADVERTISING
C.1.1 LIMITATIONS
(a) Advertising shall only be displayed in accordance with ISAF Advertising Code Regulation 20. 

C.2 CREW 
C.2.1 LIMITATIONS
(a) During a regatta the crew shall consist of a minimum of three persons and
the number shall not change.
(b) A crew member shall not be substituted during a sanctioned event without
the prior consent of the jury.
(c) A crew member shall be seated inboard of the toe rail (including legs) but
the upper body may lean outboard.
(d) A crew member shall not use standing rigging for the purpose of
accentuating a tack or jibe.
(e) A crew member shall not be permitted below decks except to temporarily
retrieve or stow equipment or to facilitate repairs.
C.3 EQUIPMENT
C.3.1 FOR USE
(a) Mandatory
(i) Personal buoyancy for each crewmember, each having positive
buoyancy of not less than 6 kg.
(ii) One throwable flotation device such as a cushion or ring with
positive buoyancy of not less than 3 kg.
(iii) One hand bailer or bucket of not less than 6 liters capacity.
(iv) One hand bilge pump.
(v) One anchor of not less than 3.6 kg in weight and with not less than
30 m of continuous line of not less than 8 mm in diameter.
(vi) Hatch covers for the companionway opening with a removable
lower cover not less than 15 cm in height.
(b) Optional
(i) Electronic or mechanical timing devices.
(ii) Analog or digital compasses.
(iii) Except at sanctioned events, electronic navigational device without
chart capability.
(iv) Spinnaker pole.
(v) Spinnaker boxes, buckets or turtles.
(vi) Whisker pole.
(vii) Flares.
(viii) Fog horn.
(ix) Running lights.
(x) Mast head fly or telltales.
(xii) VHF or marine band radio.
(xiii) First aid kit.
(xiv) Mast partner blocks. 
(xv) Adaptations for disabled sailors as in accordance with Appendix B
of these class rules.
(xvi) Any additional equipment as required to be carried aboard by local
or national governmental authority, not limited to safety
equipment.
(xvii) Permanently mounted, manual bilge pump and associated fittings
shall have its lowest discharge point not more than 150mm below
the top of the toe rail.
(xviii) Mast partner adjustment shall be block and tackle located below
the deck and may be cleated only for the purpose of moving
partner blocks.
 
C.3.2 NOT FOR USE
(a) Mandatory
One paddle or oar extendable to at least 1.5 m in length.
(b) Optional
(i) Mooring lines and towing ropes.
(ii) One outboard engine and bracket.
C.4 BOAT
C.4.1 WEIGHT
The dry weight of the complete hull and rig as raced including the following,
shall not be less than 950 kg:
(a) One set of sheets only.
(b) Hatch covers.
(c) Mast partner blocks.
(d) Fastened or permanent equipment including:
(i) Compasses (excluding batteries).
(ii) Running lights.
(iii) Bilge pump.
(iv) Mast head fly and telltales.
 (v) Lifting slings
 
C.4.2 CORRECTOR WEIGHTS
Corrector weights shall be added to the hull as prescribed below when the
boat weight is less than the amount specified in section C.4.1. Corrector
weights shall be noted on the hull certification mark.
(a) Boats weighing between 940 kg and 950 kg: Corrector weights shall be
placed in the keel sump.
(b) Boats weighing between 922 kg and 940 kg: Corrector weights in the
amount of 9 kg shall be placed in the keel sump. The balance shall be
divided equally and secured in the aft lazarette and forward of the aft face
of the mast.
(c) Boats weighing between 897 kg and 922 kg: The total corrector weight
shall be divided into three equal portions. One portion shall be placed in
the keel sump. The balance shall be divided equally and secured in the aft
lazarette and forward of the aft face of the mast.
C.5 HULL AND DECK
C.5.1 MARKINGS
(a) A current SCA Membership Sticker shall be affixed on the hull on the
starboard side, at the aft starboard corner within 25 mm of the toe rail.
(b) The hull shall have a valid hull certification mark including corrector
weight details, affixed to the aft, forward facing seat back, on the starboard
side, within 50 mm of the deck.
C.5.2 MAINTENANCE
Routine maintenance such as painting and polishing is permitted without re-
measurement and re-certification.
C.5.3 FITTINGS
Fittings type, quantity and placement shall be in conformance with Section D.
C.5.4 LIMITATIONS
(a) Application of fillers to the hull for fairing is prohibited, except within 70
mm of the bailers.
(b) Sanding on the hull is permitted to the extent that the laminates shall not
be exposed.
(c) The hull may be repaired provided that the shape, structure and
characteristics of the original are not altered.
C.6 HULL APPENDAGES
C.6.1 DIMENSIONS
The keel and rudder dimensions shall be in compliance with Section E.
C.6.2 MAINTENANCE
Routine maintenance such as painting and polishing is permitted without re-
measurement and re-certification.
C.6.3 KEEL SUMP REPAIR
The sump may be reinforced by the two following methods:
(a) Two panels of either marine plywood or glass fiber may be fitted into the
base of the keel sump and extending up to within 25 mm of the cockpit
floor. The panels may span completely across space available running
awartships. The panels may be attached with glass fiber to the sides. Final
panel thickness shall not exceed 18 mm. Holes or spaces shall be left in
the panels to allow any water to flow from one side to the other so that
bailing may be unimpeded. The panels shall not interfere with access to
the keel bolts or cause chafe on lifting slings.
(b) Layers of glass fiber may be laid up on the port and starboard sides of the
keel sump. The additional layers shall not exceed 5 mm in thickness.
C.6.4 LIMITATIONS
(a) The rudder blade and keel may be faired to the limits of the
measurements specified in section E. The application of fillers is
permitted.
(b) Sanding the keel for fairing is permitted to the extent that the lead shall
not be exposed.
(c) Sanding the rudder for fairing is permitted to the extent that the laminate
shall not be exposed.
(d) Only one rudder blade shall be used during a regatta, except when a
rudder has been lost or damaged beyond repair. Such replacement may be
made only with the consent of the race committee.
C.7 RIG
C.7.1 DIMENSIONS
The rig dimensions shall be in compliance with Section F.
C.7.2 MAINTENANCE
Routine maintenance such as cleaning, polishing, painting, repairs and the
replacement of stays is permitted without re-measurement or re-certification.
C.7.3 LIMITATIONS
(a) Only one set of spars and standing rigging shall be used during a regatta,
except when an item has been lost or damaged beyond repair. Such
replacement may be made only with the consent of the race committee.
(b) Rigging links, rigging screws and turnbuckles shall not be adjusted while
racing.
C. 7.4 RUNNING RIGGING
The running rigging shall be in compliance with section F.
C.8 SAILS
C.8.1 IDENTIFICATION
(a) Sails shall carry identification as prescribed in section G.
(b) Except to the extent permitted in By-Laws B 12.01, the sail number shall
comply with rule A.11.2.
C.8.2 DIMENSIONS
The sail dimensions shall be in compliance with section G.
C.8.3 MAINTENANCE
Routine maintenance such as cleaning or repair of damaged panels is
permitted without re-measurement or re-certification.
 
C.8.4 LIMITATIONS
(a) Not more than one mainsail, two jibs and two spinnakers shall be carried
aboard while racing.
(b) Not more than one mainsail, two jibs and two spinnakers shall be used
during a sanctioned event, except when a sail has been lost or damaged
beyond repair. Such replacement may be made only with the consent of
the jury.
(c) A boat shall not purchase more than five individual sails in a calendar year
C.8.5 SETTING
Sails shall be hoisted on a halyard. The arrangement shall permit hoisting and
lowering of the sails at sea.
(a) Mainsail
(i) The highest visible point of the sail, projected at 90° to the mast
spar, shall not be set above the upper point. The intersection of
the leech and the top of the boom spar, each extended as
necessary, shall not be aft of the outer point.
(ii) Luff and foot boltropes shall be in the spar grooves or tracks.
(b) Spinnaker
Only one sail shall be set at any time.

Section D – Hull and Deck
D.1 PARTS
D.1.1 MANDATORY
(a) Hull shell
(b) Deck
(c) Berth shell
(d) Toe rail
(e) Positive flotation consisting closed cell foam or sealed air tanks.
(f) Bulkheads
D.1.2 OPTIONAL
No holes through the hull or deck shall be allowed except as noted below or
otherwise allowed in these class rules.
(a) Up to four drain holes on each side of the deck or toe rail, located at the
sheerline.
(b) Up to four drain holes in each seat lazarette, each not more than 7 mm in
diameter.
(c) Up to four holes in each toe rail through which fittings may be attached,
each not more than 10 mm in diameter.
***(d) A hole in the foredeck of 10mm maximum diameter, on the centreline and
not more then 330mm forward of the forward most point of the mast
opening that may only be used for the spinnaker pole downhaul.
(e) Up to seven holes for running rigging, located in the aft face of the cabin
above the companionway, each not more than 20 mm in diameter.
(f) Two self-bailers installed in the aft corners of the cockpit floor.  
(g) One keel sump drainage fitting.
D.2 CONSTRUCTION
D.2.1 Construction shall be in accordance with the Sonar Construction Plans.
D.3 MEASUREMENT
D.3.1 Measurement shall be carried out in accordance with the ERS.
D.4 CERTIFICATION
D.4.1 The hull shall comply with the class rules in force at the time of initial
fundamental measurement. 
D.4.2 Certification of the hull shall be in accordance with Section A of the class
rules.
D.5 IDENTIFICATION
D.5.1 Hulls manufactured on or after March 1, 2000 shall carry the ISAF Plaque
and the builder’s plaque permanently affixed to the center of the aft face of the
cockpit between the top of the seat and the deck.
D.6 BUILDERS
D.6.1 The hull builder shall be approved by the ISAF.
D.6.2 All moulds shall be approved by the ISAF.
D.7 ASSEMBLED HULL
D.7.1 FITTINGS
(a) Mandatory
(i) Forestay fitting.
(ii) Backstay fitting.
(iii) Shroud plates.
(iv) Maximum two headsail tracks with one car per track.
(v) Mainsheet traveller track shall be located in the traveller track seat
recess and shall have no curvature.
(vi) Maximum two mainsheet traveller cars.
(vii) Mast step that shall not be adjustable.
(viii) One or two bow chock(s) or eye(s) capable of accepting a 22mm
line.
(ix) One foredeck mooring cleat or eye capable of accepting a 22mm
line.
(b) Optional
(i) Two stern cleat(s) or eye(s).
(ii) Headsail halyard winch or tensioner.
(iii) Mainsail sheet blocks, fairleads and cleats.
(iv) Mainsail Cunningham blocks, fairleads and cleats.
(v) Maximum two headsail sheet winches.
(vi) Headsail sheet blocks, fairleads and cleats.
(vii) Headsail barber-hauler fairleads, blocks and cleats.
(viii) Spinnaker sheet and guy fairleads, blocks and cleats.
(ix) Spinnaker barber-hauler fairleads, blocks and cleats.
(x) Up to four hand holds on each upright (backrest) surface of the
deck.
(xi) Stowage clips for paddle(s), spinnaker pole, sail bags and other
equipment.
(xii) Bilge pump(s) which may discharge through hull shell or deck.
(xiii) Analog or digital compass.
(xiv) Deck clips for cockpit cover and/or tent.
(xv) Headsail roller furling device mounted above the deck.
D.7.2 DIMENSIONS
  minimum maximum
(a) Center of forestay pin hole to bow 100 mm below
the deck......................................................................... 135 mm 155 mm
(b) Center of forestay pin hole to center of outboard
shroud hole................................................................... 2946 mm 2997 mm
(c) Center of outboard shroud hole to sheerline................ 152 mm 178 mm
(d) Fore and aft dimension of mast spar hole
measured 10 mm below the top surface.......................  206 mm
(e) Combined mast step thickness from gel coat
surface to mast datum point.......................................  17 mm
(f) Aft side of mast datum point to center of
companion opening sill measured at the gel coat
surface.......................................................................... 717 mm 740 mm
(g) Mainsheet traveller track length...................................  1042 mm
(h) Top of traveller track to highest point of seat,
measured at points 100mm forward and 100mm
aft of the centerline of the track....................................  20mm

Section E – Hull Appendages 
E.1 PARTS
E.1.1 MANDATORY
(a) Keel
(b) Rudder
E.2 MEASUREMENT
E.2.1 Measurement shall be carried out in accordance with the ERS.
E.3 KEEL
E.3.1 CERTIFICATION
The keel shall comply with the class rules in force at the time of the initial
fundamental measurement of the hull in accordance with E.3.3. 
E.3.2 MANUFACTURERS
Manufacturer shall be an approved hull builder.
E.3.3 CONSTRUCTION
(a) The keel shall be manufactured in accordance with the Sonar Construction
Plans.
(b) Moulds shall be approved by the ISAF.
E.3.4 FITTINGS
(a) Lifting eye(s)/strap(s) shall be attached to the keel bolts.
(b) Lifting eye(s)/strap(s) as included in the weight in section C.4 shall weigh
not more than a total of 3 kg.
E.3.5 DIMENSIONS
(a) Keels manufactured prior to March 1, 2000:
The keel shall conform to the tolerances in force at the time of
manufacture.
(b) Keels manufactured or altered on or after March 1, 2000:
The keel shall conform to the tolerances of Section H.
E.4 RUDDER BLADE, RUDDER STOCK AND TILLER
E.4.1 CERTIFICATION
The rudder shall comply with the class rules in force at the time of
fundamental measurement of the hull.
E.4.2 MANUFACTURERS
Manufacturer shall be an approved hull builder.
E.4.3 MATERIALS
The tiller shall be made of wood or metal.
E.4.4 CONSTRUCTION
(a) The rudder shall be manufactured in accordance with the Sonar
Construction Plans.
(b) Moulds shall be approved by the ISAF.
E.4.5 FITTINGS
(a) Mandatory
(i) Rudder cap.
(ii) Tiller of optional design.
(b) Optional
Hiking stick of optional design.
E.4.6 DIMENSIONS
(a) Rudders manufactured prior to March 1, 2000:
The rudder blade shall conform to the tolerances in force at the time of
manufacture.
(b) Rudders manufactured or altered on or after March 1, 2000:
The rudder shall conform to the tolerances of Section H.
E.4.7 WEIGHTS
(a) Tiller less fittings shall not weigh less than 1.4 kg.
 
Section F – Rig
F.1 PARTS
F.1.1 MANDATORY
(a) Mast
(b) Boom
(c) Standing rigging
(d) Running rigging
F.1.2 OPTIONAL
(a) Spinnaker pole
(b) Whisker pole
 (c) A flexible device that holds the slack of the backstay off the leech of the
mainsail. This shall not be adjustable while racing and shall not change the
attachment points of the backstay, nor alter the line of the backstay under
load between the attachment points.
F.2 GENERAL
F.2.1 MEASUREMENT
(a) Measurement shall be carried out in accordance with the ERS.
F.2.2 DEFINITION
The mast datum point shall be the lowest point on the mast extrusion.
F.3 MAST
F.3.1 CERTIFICATION
(a) The spar and its fittings shall comply with the class rules in force at the
time of fundamental measurement of the spar.
(b) The spar shall be certified by either;
(i) the original manufacturer at time of manufacture, or;
(ii) an official measurer.
(c) The spar shall carry an SCA certification mark with the date of
fundamental measurement. It shall be affixed to the starboard side of the
spar, above and within 100 mm of the lower limit mark.
F.3.2 MANUFACTURER
Manufacturer shall be approved by the SCA.
F.3.3 MATERIALS
The spar shall be of aluminium alloy. It may be anodised.
F.3.4 CONSTRUCTION
(a) The spar extrusion shall include a fixed sail groove that shall be integral
with the spar extrusion.
(b) Holes may be made in the spar only for fittings or rigging.
(c) The gooseneck fitting shall be fixed in location.
F.3.5 FITTINGS
(a) Mandatory
(i) Mast head fitting.
(ii) Forestay and shroud T-ball backing plates.
(iii) A set of fixed spreaders of non-tapered aluminium extrusion.
(iv) Mainsail halyard sheave box.
(v) Headsail halyard sheave box.
(vi) Spinnaker halyard sheave box.
(vii) Two spinnaker pole fittings.
(viii) Spinnaker pole or whisker pole lift block.
(ix) Gooseneck.
(x) Kicking strap attachment.
(b) Optional
(i) One mechanical wind indicator.
(ii) Compass bracket.
(iii) Slots for halyards, pole lifts and Cunningham.
 
F.3.6 DIMENSIONS
  minimum maximum
(a)  Mast Length................................................................10275 mm  10315 mm
(b) Mast Spar Curvature at 6100 mm from the
mast datum point........................................................  50 mm
(c) Mast Spar Cross Section at 8458 mm from the
mast datum point:
(i) Fore and aft....................................................... 100 mm 103 mm
(ii) Transverse........................................................ 66 mm 72 mm
(d) Limit Mark Width...................................................... 25 mm
(e) Lower Point Height.................................................... 1727 mm 
(f) Upper Point Height....................................................  10110 mm
(g) Forestay Height........................................................... 8223 mm 8236 mm
(h) Shroud Height:
(i) Lower................................................................ 4438 mm 4451 mm
(ii) Upper................................................................ 8223 mm 8236 mm
(i) Spinnaker Pole Fitting height:
(i) Lower................................................................ 2042 mm 2064 mm
(ii) Upper................................................................ 2432 mm 2445 mm
(j) Spinnaker Pole Fitting Projection.............................  60 mm
(k) Spinnaker Hoist Height.............................................  8389 mm
 
 (l) Spreader:
(i) Transverse length measured as the
distance between the inner edge of both
upper shrouds on the upper edge of each
spreader........................................................... 1426 mm 1486 mm
(ii) Fore and aft length measured as the
distance from the aft face of the spar to a line intersecting the aft edge of both
shrouds.............................................................. 71 mm 135 mm
(iii) Height............................................................... 4555 mm 4570 mm
(m) Spreader Cross Section:
(i) Fore and aft....................................................... 45 mm
(ii) Vertical............................................................. 18 mm
F.3.7 WEIGHTS
  minimum
Mast Tip Weight............................................................... 10 kg
F.4 BOOM
F.4.1 CERTIFICATION
(a) The spar and its fittings shall comply with the class rules in force at the
time of fundamental measurement of the spar.
(b) The spar shall be certified by either;
(i) the original manufacturer at time of manufacture, or;
(ii) an official measurer.
(c) The spar shall carry an SCA certification mark with the date of
fundamental measurement. It shall be affixed to the starboard side of the
spar, forward and within 100 mm of the outer point.
F.4.2 MANUFACTURER
Manufacturer shall be approved by the SCA.
F.4.3 MATERIALS
The spar shall be of aluminium alloy. It may be anodised.
F.4.4 CONSTRUCTION
(a) The spar extrusion shall include a fixed sail groove that shall be integral
with the spar extrusion.
(b) The spar groove may be cut away or modified for a distance not
exceeding 400 mm from the aft face of the mast.
(c) Holes may be made in the spar only for fittings or rigging.
(d) The spar shall not be tapered at any point on its length.
(e) The extension of the top of the boom measured at 90 degrees to the mast
spar shall not be below the lower point.
F.4.5 FITTINGS
(a) Mandatory
(i) One or two mainsheet block attachment(s).
(ii) Clew outhaul blocks and attachments.
(iii) Kicking strap fitting.
(iv) Gooseneck attachment.
(b) Optional
(i) Spinnaker pole or whisker pole stowage fittings.
(ii) Elastic material and blocks for absorbing excess outhaul rope.
 
F.4.6 DIMENSIONS
  minimum maximum
(a) Boom Spar Curvature................................................  25 mm
(b) Boom Spar Cross Section:
(i) Vertical............................................................. 88 mm 98 mm
(ii) Transverse........................................................ 55 mm 65 mm
(c) Limit Mark Width...................................................... 25 mm
(d) Outer Point Distance..................................................  3404 mm
F.5 SPINNAKER POLE
F.5.1 CERTIFICATION
Certification is not required.
F.5.2 MANUFACTURER
Manufacturer is optional.
F.5.3 MATERIALS
The spar shall be of aluminium alloy. It may be anodised.
F.5.4 CONSTRUCTION
The spar may be tapered for a maximum of 400mm from either end.
F.5.5 FITTINGS
Fittings are optional.
 
F.5.6 DIMENSIONS
  minimum maximum
         (a) Length  2610 mm
(b) Diameter....................................................................... 50 mm
F.6 WHISKER POLE
F.6.1 CERTIFICATION
Certification is not required.
F.6.2 MANUFACTURER
Manufacturer is optional.
F.6.3 MATERIALS
The spar shall be of Glass Reinforced Plastic (GRP) or aluminium alloy. It
may be anodised.
F.6.4 CONSTRUCTION
Construction is optional.
F.6.5 FITTINGS
Fittings are optional.
F.6.6 DIMENSIONS
  minimum maximum
(a) Length........................................................................... 3000mm 3100 mm  
(b) Diameter....................................................................... 35 mm 64 mm
F.6.7 PROHIBITED
The use of a Whisker pole while a spinnaker is set.
F.7 STANDING RIGGING
F.7.1 CERTIFICATION
Certification is not required.
F.7.2 MANUFACTURER
Manufacturer is optional.
F.7.3 MATERIALS
The standing rigging shall be of stainless steel.
F.7.4 CONSTRUCTION
(a) Mandatory
(i) Forestay of 1 x 19 x constant cross section wire.
(ii) Shrouds of 1 x 19 x constant cross section wire.
(iii) Backstay of 1 x 19 x constant cross section wire.
F.7.5 FITTINGS
(a) Mandatory
(i) Forestay rigging link or rigging screw of non quick release design.
(ii) Shroud rigging screws of non quick release design.
(iii) Backstay checkstay of wire or rope between the lower end of the
backstay and the backstay fitting on the hull.
(b) Optional
Boom preventer
F.7.6 DIMENSIONS
  minimum maximum
(a) Forestay length from center of lower rigging link
or rigging screw pin to rigging point.......................... 7848 mm 8001 mm
(b) Forestay diameter......................................................... 3.8 mm
(c) Shroud diameter........................................................... 3.8 mm
(d) Backstay diameter........................................................ 3.0 mm
F.8 RUNNING RIGGING
F.8.1 CERTIFICATION
Certification is not required.
F.8.2 MANUFACTURER
Manufacturer is optional.
F.8.3 MATERIALS
Materials are optional unless specified in section F.8.4.
F.8.4 CONSTRUCTION
(a) Mandatory
(i) Mainsail halyard shall be wire, rope or a combination of both.
(ii) Mainsail sheet shall be rope.  
(iii) Backstay and traveller control lines shall be rope.
(iv) Kicking strap shall be wire, rope or a combination of both.
(v) Headsail halyard shall be wire, rope or a combination of both.
(vi) Headsail sheets shall be rope.
(vii) Spinnaker halyard shall be rope.
(viii) Spinnaker sheet and guy shall be rope.
(ix) Spinnaker pole or whisker pole lift shall be wire, rope or a
combination of both.
(b) Optional
(i) Mainsail Cunningham line shall be wire, rope or a combination of
both.
(ii) Mainsail outhaul shall be wire, rope or a combination of both.
(iii) Spinnaker pole or whisker pole downhaul shall be rope.
(iv) Spinnaker barber-haulers shall be rope.
(v) Whisker pole launching or retrieval device shall be rope, elastic
cord or a combination of both.
F.8.5 FITTINGS
(a) Mandatory
None.
(b) Optional
Spinnaker sheet barber-haulers to run on spinnaker sheet or guy.
F.8.6 LIMITATIONS
 Rules of this section may be modified for a Paralympic Team in accordance with Appendix B.
(a) Main halyard shall be single part and may have up to two cleat locations
below the lower point.
(b) Headsail halyard shall be single part and shall have not more than two cleat
locations. 
 (c) Headsail halyard fine tune shall be of block and tackle construction.
(d) Mainsheet shall be single ended with one cleat location.
(e) Headsail sheets may have up to two cleat locations per side.
(f) Headsail sheets may have a fine tune of block and tackle construction.
(g) Headsail downhaul of not more than one to one mechanical advantage,
attached to the head and led back to the cockpit. It shall not be cleated.
(h) The spinnaker pole or whisker pole downhaul and lift shall each have one
cleat location.
(i) Traveller control line shall have not more than two cleat locations per side.
(j) Cunningham shall have one cleat location.
(k) Mainsail outhaul shall be of block and tackle construction and shall have one
cleat location.
(l) Kicking strap shall be of block and tackle construction and shall have one
cleat location.
(m) Mainsheet traveller track shall be located in traveller track seat recess.
(n) Headsail sheet car position adjustment may use a spring pin type locking
device or a block and tackle located on the deck that may have up to two cleat
locations per side.

Section G – Sails
G.1 PARTS
G.1.1 MANDATORY
(a) Mainsail
(b) Headsail
G.1.2 OPTIONAL
Spinnaker
G.2 MEASUREMENT
G.2.1 Measurement shall be carried out in accordance with the ERS.
G.3 CERTIFICATION
      G.3.1 Sails shall comply with the class rules in force at the time of initial
fundamental measurement.
G.3.2 Sails shall carry a certification mark near the tack point. The mark shall be
signed and dated by an official measurer.
G.4 SAILMAKERS
G.4.1 Sailmaker is optional.
G.5 MAINSAIL
G.5.1 IDENTIFICATION
(a) Insignia
(i) The class insignia shall conform to the dimensions in Section H.1.3
and be positioned in conformance to the RRS.
(ii) The color shall be red.
(b) Numbers and national letters
(i) Numbers and national letters shall conform to the RRS except as
modified in G.5.1 (b) (ii).
(ii) Mainsails constructed prior to March 1, 2000 shall not require
national letters.
(iii) The color shall be black.
G.5.2 CONSTRUCTION
(a) The construction shall be: soft sail, single-ply sail.
(b) The body of the sail shall consist of woven ply throughout. The ply fibres
shall be of polyester.
(c) The sail shall have four batten pockets in the leech.
(d) The leech shall not extend beyond a straight line from the clew point to
the intersection of the leech and the lower edge of the lower batten
pocket.
(e) The sail may include slab reefing with up to four points in the body of the
sail.
(f) The sail shall include luff and foot boltropes.
(g) The following are permitted: Stitching, glues, tapes, corner eyes, reef eyes,
headboard with fixings, cunningham eye or pulley, reinforcements,
batten pocket elastic, batten pocket patches, flutter patches, chafing
patches, batten pocket end caps, Mast and boom slides, leech line with
cleat, two windows, tell tales, sail shape indicator stripes, sail numbers,
national letters and class insignia, sailmaker labels, class royalty label,
certification mark.
G.5.3 DIMENSIONS
  minimum maximum
(a) Leech Length ..............................................................  8892 mm
(b) Upper Width 483 mm from head point.....................  375 mm
(c) Half Width ..................................................................  2282 mm
(d) Three-Quarter Width ................................................  1396 mm
(e) Weight of the Ply of the body of the sail ................... 192 gr/m2
(f) Window area................................................................  0.3 m2
(g) Outside Batten Pocket Length:
(i) Uppermost and lowermost pockets..................  805 mm
(ii) Intermediate pockets.........................................  960 mm
(h) Head Point to intersection of leech and centerline
of uppermost batten pocket ........................................ 1740 mm
(i) Clew Point to intersection of leech and centerline
of lowermost batten pocket ........................................ 1740 mm
(j) Tack Point to center of reef grommet parallel to
the luff.......................................................................... 900 mm 1100 mm
(k) Clew Point to center of reef grommet parallel to
the leech....................................................................... 900 mm 1100 mm
G.6 HEADSAIL
G.6.1 CONSTRUCTION
(a) The construction shall be: soft sail, single-ply sail.
(b) The body of the sail shall consist of woven ply throughout. The ply fibres
shall be of polyester.
(c) The headsail shall have two or three batten pockets in the leech.
(d) The following are permitted: Stitching, glues, tapes, corner eyes, hanks,
reinforcements, batten pocket elastic, batten pocket patches, flutter
patches, batten pocket end caps, leech line with cleat, foot line with cleat,
two windows, tell tales, sail shape indicator stripes, sheeting blocks,
sailmaker labels, class royalty label, certification mark.
G.6.2 DIMENSIONS
  minimum maximum
(a) Luff Length.................................................................  7240 mm
(b) Leech Length...............................................................  6477 mm
 
(c) Luff Perpendicular.....................................................  2515 mm
 (d) Foot Median................................................................  7000 mm
(e) Half Width...................................................................  1285 mm
(f) Three Quarter Width.................................................  650 mm
(g) Upper Width 183 mm from head point….................  102 mm
(h) Weight of the ply of the body of the sail..................... 188 gr/m2
(i) Window area................................................................  0.2 m2
(j) Outside Batten Pocket Length:
(i) Top....................................................................  335 mm
(ii) Intermediate and/or bottom..............................  430 mm
(k) Head Point to intersection of leech and centreline
of uppermost batten pocket......................................... 1580 mm
(l) Clew Point to intersection of leech and centreline
of lowermost batten pocket......................................... 1580 mm
G.7 SPINNAKERS
G.7.1 IDENTIFICATION
(a) Numbers and national letters
(i) Numbers and national letters shall conform to the RRS.
(ii) The color shall be contrasting with the background.
G.7.2 CONSTRUCTION
(a) The construction shall be soft sail, single-ply sail.
(b) The body of the sail shall consist of woven ply throughout. The ply fibres
shall be of polyamide.
(c) The following are permitted: Stitching, glues, tapes, corner eyes, eyes,
reinforcements, tell tales, sailmaker labels, class royalty label, sail
identification, certification mark.
G.7.3 DIMENSIONS
  minimum maximum
(a) Leech Lengths............................................................. 7467 mm 7620 mm
(b) Foot Length................................................................. 4700 mm 4800 mm
(c) Foot Median................................................................  8850 mm
(d) Difference between diagonals.....................................  50 mm
(e) Half Width................................................................... 4565 mm 4715 mm
(f) Weight of the ply of the body of the sail..................... 32 gr/m2
  
PART III – APPENDICES
Appendix A – Documents
Section H – Official Plans and Forms
H.1.1 Keel Plan designated KEEL-1
H.1.2 Rudder Plan designated RUDDER-1
H.1.3 Insignia Plan designated INSIGNIA-1
H.1.4 Certification Marks designated MARKS-1
H.1.5 Hull Measurement Form designated HMF-1
 
Appendix B – Alternative Rules
Rules or modifications within this appendix apply to SCA, IFDS or Disabled Sailing
National Authority sanctioned events designated as an “SCA Appendix B – Alternative
Rules” event.
Section I – Conditions for Racing
I.1 GENERAL
I.1.1 The Notice of Race shall state that “This is an SCA Appendix B – Alternative
Rules event.”
I.1.2 Except as modified or amended in this appendix, the requirements of Parts I
and II shall apply.
I.1.3 Adaptations specifically permitted in this appendix must be easily removed so
that the boat conforms to Part II of the class rules.
I.2 DEFINITIONS
I.2.1 Disabled Sailor: A person who is eligible, under the IFDS Functional
Classification System, to compete in IFDS sanctioned or
disabled sailing National Authority events and possesses
a current Classification Number issued by an IFDS
International or National Classifier or by an MNA.
I.2.2 Paralympic Team: A team whose helmsman is a Disabled Sailor who has
obtained Paralympic eligibility status by the IFDS, or an
MNA.
I.2.3 Adaptation: Temporary equipment and/or modification such as a chair
or transfer bench designed to assist the Disabled Sailor
while in the boat, as opposed to a personal device such as
a prosthesis.
I.3 ADVERTISING
I.3.1 Advertising shall be in accordance with class rules C.1.
I.4 ELIGIBILITY
I.4.1 A Paralympic Team shall provide the organising authority of a sanctioned
event with a current valid letter from the IFDS or his/her MNA verifying that
it has obtained Paralympic Team status. Such letter shall be delivered
electronically or otherwise to the organizing authority and the SCA with the
entry form for the event.
I.5 CREW
Rules of this section are in addition to or modify the rules of section C.2.
I.5.1 LIMITATIONS
(a) A crew shall consist of three persons.
(b)One member of the crew shall remain seated in the cockpit at all times,
except:
(i) during manoeuvres,
(ii) when the safety of the boat or the crew are at risk,
(iii) when it is necessary to repair damage to the boat or its fittings
while on the water.
(c) The options of hiking/sitting out and the use of the fittings to do this, shall
be in accordance with the SCA class rules.
I.6 EQUIPMENT
I.6.1 OPTIONAL
IFDS approved Adaptations shall be used by Disabled Sailors only and shall
comply with the requirements as specified in the ISAF/IFDS Race
Management Manual, Notice of Regatta or Sailing Instructions.
I.6.2    Electrically operated seat tilt and steering joystick devices.
I.6.3 PROHIBITED
Spinnakers
I.6.4 LIMITATIONS
As a modification to Rule C.8.4 (c), the number of sails purchased in a
calendar year for a Paralympics Team is unlimited. 
I.7 BOAT
Rules of this section are in addition to or modify the rules of section C.4.
I.7.1 WEIGHT
(a) A boat shall be weighed and corrector weights installed in accordance
with class rule C.4.
(b) Following compliance with I.7.1 (a), a boat may compensate for the
additional weight of secured Adaptations by removing corrector weights
only and shall be re-weighed accordingly.
(c) When removing correctors in compliance with I.7.1 (b), correctors shall be
removed from the sump first.
I.7.2 PROHIBITED
The drilling of holes, fastening of or permanent installation of additional
fittings in a chartered boat.
I.8 RUNNING RIGGING
The rules of this section modify the rules of section F.8.6.
I.8.1 LIMITATIONS
(a) Mainsheet may have up to two running ends and two cleat locations.
(b) Mainsheet may have a fine tune of not more than 3 to 1 mechanical
advantage.
(c) Traveller control lines may have up to two running ends and four cleat
locations per side.